Successful use of recombinant hirudin and its monitoring by ecarin clotting time in patients with heparin-induced thrombocytopenia undergoing off-pump coronary artery revascularization.Iqbal,O.; Tobu,M.; Aziz,S.; Gerdisch,M.; Da Valle,M.; Demir,M.; Hoppensteadt,D. A.; Ahmad,S.; Walenga,J. M.; Fareed,J.JOURNAL OF CARDIAC SURGERY 2005 ;20(1):42-51